Can we freeze water at −1 °C?

Is it possible to freeze water if it is directly exposed to $-1\ \mathrm{^\circ C}$ and not $0\ \mathrm{^\circ C}$? Is freezing point the minimum temperature at which a substance can be froze?

• Yes, it will start cooling down to -1, going though 0 and then freezing at 0. You can in theory supercool water, but that's another story. The freezing point is the temperature that a substance is frozen below it. – Gimelist Aug 15 '16 at 6:40

It is possible by pressure too! Above $10~\mathrm{MPa}$ melting point of water decreases. At $209.9~\mathrm{MPa}$ melting point become $-21.9°\mathrm{C}$. For more information, see this page.